Like I said, I haven't tried the latest build, but I made heavy use of the shotgun's double-hit attack to clear out groups of enemies.
Be sure to try that out.
I do wish that you had a more reliable method of farming material for crafting though. Fighting batches of enemies in hopes of getting something is kind of a losing proposition because I was using one kind of restorative or other after almost every fight so I was barely staying afloat.
It'd be nice if you could get parts that would help you craft healing items or grenades by stealth-killing enemies.
That way if you're having trouble, you can just sneak up on some dudes for a while, whilst you stock up on health-kits and ammo.
That would basically eliminate the resource-pressure though, since you can grind infinitely.